Adjustable belt-guide for drilling-machines



I. H. WRIGHT. 'ADIUSTABL-E BELT GUIDE FOR DRILLING MACHINE-S.

APPLICATION FILED DEC. I6, I9I 9.

Patented June 7, 1921.

I. H. WRIGHT.

ADJUSTABLE BELT GUIDE FOR DRILLING MACHINES.

APPLICATION FILED DEC.16, I919.

4 1,380,623. PatentedJune 7, 1921.

a SHEETS-SKEW 2.

LI'. H. WRIGHT.

ADJUSTABLE BELT GUIDE FOR DRILLING MACHINES. APPLICATION FILED 05c I6. 1919.

1,3 0, I Patented June 7,1921.

2 SHIRTS-SHEET 3.

I IUD-61725601 I A-vby.

STATES entrant series.

ISAAC HENRY WRIGHT, OF SALFORD, MANCHESTER, ENGLAND, ASSIGNOR T0 SMITH & COVENTRY LIMITED, 0? SALFORD, ENGLAND ADJUSTABLE BELT-GUIDE FOR DRILLING-MACHINES.

Specification of Letters Patent.

Patented June "2', rear.

Application filed December 16, 1919. Serial No. 345,299.

To all whom it may concern:

Be it known that T, ISAAC HENRYWRIGHT, a subject of the King of Great Britain and Ireland, and resident of Gresley Ironworks, Salford, Manchester, England, have invented certain new and useful Improvements 1n Adjustable Belt- Guides for Drilling-Machines, of which the following is a specification.

This invention relates to drilling machines of the typein which a stepped pulley rotates the spindle and in which adyustable carrier and guide pulleys are provided for the belt, and has for its object to prov de improved means for setting and ELClJUStHlg the guide pulleys.

The invention comprises the arrangement of the guide pulley of the leadlng s1de of the belt upon a support pivoted upon a slide and combined with stops so that 1n its extreme positions the guide pulley is correctly set to lead the belt on to the stepsof the spindle driving pulley and to tension the belt.

The invention further comprises the provision of automatic locking means for the guide pulley slide whereby the belt is tensioned, and the arrangement of a hand actuated lever for the said slide so that in the first portion of its movement to release the belt tension, it disengages the said locking means.

The invention further comprises the details of construct-ion hereinafter described.

Referring to the three accompanying sheets of explanatory drawings Figure 1 is a side elevat on, Flg. 2 a plan View, Fig. 3 a view looking from left to right of Fig. 1 and F 1g. 4 a v1ew look1ng from right to left of Fig. l showlng portion of a drilling machine constructed and arranged in one convenient form in accordance with my invention. Certain parts are omitted from the various views for the sake of clearness. Figs. 5 and 6 are sectional side elevations of the catch device employed with the hand lever for operating the slide carrying the guide pulleys, Fig. 5 showlng the operative positionof the catch and F 1g. 6 its inoperative positlon. v

The same reference letters in the different views indicate the same parts.

The slide a carrying the carrier or guide pulleys b, 0 is mounted upon a bar l pro ecting from the column 6 of the drillmg machine. The guide pulley 0 for the return stretch of belt is a broad pulley running on a fixed spindle f in the slide, while the guide pulley b for the leading stretch of belt is mounted upon an arm 9 pivoted to the slide at h and capable of being turned about such pivot to bring the pulley into two positions, shown in full and dotted lines, in which it serves to lead the belt to the steps of the spindle driving pulley. Stops i, j upon the arm 9 and a stop is upon the slide limit the movement of the pivoted arm 9. I The slide a is traversed upon its supporting bar (Z for belt tensioning purposes and we pivot a friction catch m upon the lowermost portion of the slide. Such catch m is normally held by a spring 12 in contact with the rod d and wedges itself tight against the same as the slide tends to move toward the column 6 under the belt tension. Such operative position of the catch m is shown in Fig. 5. A hand operated lever 0 and link 29 operate the slide, the link abutting against the slide at 9' as shown, so that when moved to the right by the lever 0 it will push the slide away from the column 6 to tension the belt. The catch m does not prevent such movement but it is opposed by the belt tension. A pin 1 upon the catch enters an enlarged slot 8 in the link p forming a pivotal connection between said link and catch m, such that when the lever 0 is operated to move the slide toward the column 6, it first releases the catch m and movessam-e to its inoperative position shown at Fig. 6, and then moves the slide. The one hand lever 0 therefore serves to control the moveu'ients of the slide a and the locking and unlocking of the same upon the supporting bar cl.

The guide pulley b for the leading stretch of belt serves to direct the belt correctly and also to take up or pay out the required amount of belt for tensioning purposes, according to the size of driving pulley in service. The movement of the slide a adjusts the belt tension. The friction catch m automatically holds the slide in the position of maximum belt tension unless released by the handle 0 before referred to.

The arrangement is conveniently situated for ready manipulation and control.

I may vary the details to suit any par-. ticular service or requirement.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. In drilling machines of the type specilied, in combination, a guide pulley carrying slide, a rod upon Which said slide is mounted, a pivoted locking catch upon the slide normally held in engagement With said rod, a hand operated link for moving the slide, the said link actuating the catch to disengage the same prior to moving the slide for releasing the belt tension, as set forth.

2. In drilling machines of the typespecifled, in combination, a guide pulley carrying slide, a rod upon Which said slide is mounted, a pivoted locking catch upon the slide. normally held in engagement with said rod,

a hand operated linkfor moving the slide, the said link actuating the catch to disengage the same prior to moving the slide for releasing the belt tension, a pivoted carrier upon the slide carrying the guide pulley of the leading side of the belt and stops limiting'the movement of the said pivoted carrier, as set forth.

In testimony whereof l have signed my name to this specification.

ISAAC HENRY WEIGHT. 

